Abstract

Update

Abstract

English

Chinese

Acknowledgment

Acknowledgments

This work was supported in part by National Basic Research Program of China (973 Program) (Grant No. 2013CB338004), National Natural Science Foundation of China (Grant Nos. 61173191, 61272491, 61309021, 61472357, 61571063), Zhejiang University Fundamental Research Funds for the Central Universities (Grant No. 2015QNA5005), and Science and Technology on Communication Security Laboratory (Grant No. 9140C110602150C11053).